"Azure"
Rationale: Grand Cayman is the largest of the three Cayman Islands in the Carribean. It is noted for the amazing clarity of the sea water, mostly due to the fact that there is no fresh water on the island. The color of the water can best be described as "azure". Azure is also a synonym to the word "heaven". This name is a perfect fit for a spa situated on island that people go to to escape their everyday annoyances and to relax. The "azure" blue is everywhere on this island; in the sky and in the water, why not name the spa "Azure", just to remind guests that they are experiencing a little piece of heaven while they are there?